Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f77a0129c812c830f27e2a8e54422524d286c0bb77d3c98c6b0cd80ebada3bf4' 
  AND token = 'o6KA1SrEA6BSPB7eQiUsNK7VzCSWtqFtSTM4ZWCKdpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}