SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c59f583cb1b5c027b19bf6685bfd436de3f3fb5dc85c2914fcbba2630a93ee88' 
  AND token = 'dY8S2hHPzN9vtXGMvW6JuxUhOtOgzcHVuSL36Z//XEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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