SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c218cc283c7e2cb7f4c16c6f3fe9f651876a39ed4d8e443312fd41fbd857ec2' 
  AND token = 'm0bGl/kULJdJsKVXU6apYZSQqvVoirMsgR6pYiN65M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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