searching against decrypted column

I'm using Postgres on AWS RDS. My application is encrypting selected columns in a table using AWS KMS encryption. I tried but could not find a way to configure KMS keys and use the decrypt() in select query. For example, my app is encrypting myTable.secureColumn using KMS. Now, I'm trying to fire below query: select * from myTable where decrypt(secureColumn, 'key', 'aes') = 'data'; I didn't find how to configure KMS keys in pgCrypto and use in above query. Has anyone tried this? Thanks in advance.