How to check how many keys stored in Aerospike?

I am new to Aerospike and exploring AQL and ASADM. I Executed command "show sets" and got response -

aql> show sets
+------------------+-------------+---------+-------------------+---------------+-------------------+-------------------+--------------+------------+
| disable-eviction | ns          | objects | stop-writes-count | set           | memory_data_bytes | device_data_bytes | truncate_lut | tombstones |
+------------------+-------------+---------+-------------------+---------------+-------------------+-------------------+--------------+------------+
| "false"          | "tvpreprod" | "35249" | "0"               | "data"        | "1684642852"      | "0"               | "0"          | "0"        |
| "false"          | "tvpreprod" | "12229" | "0"               | "epg"         | "3035957260"      | "0"               | "0"          | "0"        |
| "false"          | "tvpreprod" | "6009"  | "0"               | "account"     | "6288324"         | "0"               | "0"          | "0"        |
| "false"          | "tvpreprod" | "24821" | "0"               | "epg_account" | "59593681"        | "0"               | "0"          | "0"        |
| "false"          | "tvstage"   | "2956"  | "0"               | "data"        | "66573412"        | "0"               | "0"          | "0"        |
| "false"          | "tvstage"   | "1873"  | "0"               | "account"     | "1984140"         | "0"               | "0"          | "0"        |
| "false"          | "tvstage"   | "18060" | "0"               | "epg_account" | "30209254"        | "0"               | "0"          | "0"        |
| "false"          | "tvstage"   | "5197"  | "0"               | "epg"         | "1792880530"      | "0"               | "0"          | "0"        |
+------------------+-------------+---------+-------------------+---------------+-------------------+-------------------+--------------+------------+
[xx.xx.xx.xx:3000] 8 rows in set (0.781 secs)

But on executing : select * from tvstage.data, I got result -

138 rows in set (3.796 secs)

I am not able to understand why there is difference in count? **Show sets** gives 2956 records, but **Select** shows only 138 records. All the keys pushed are having different TTLs and expiry is set to not more than 24 hours