SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeb58b80466a52833dd3f812b6ff9bbd260bc5966da95fc88dfd5223b2ccb158' 
  AND token = 'ZFr6CI/7VAd4UJKKPi+nFIBJH4sc9nsiR5pFJUmODDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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