Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae8ed3c0d1dbebdd33b0913b6b5534bf1e0931086c68818528740e825a80bcda' 
  AND token = 'bFzzF4vJXvvfDMQzBRusNM2Ts3QRgU2Hzc/lV2T8JzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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