SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '114299157ad979980a52b3bbcd1de4156c057bfc17b61da7527561c0d0aaff7d' 
  AND token = 'Bb8wuqaVgMDkvx4pG+Z2C4CRPrh0BJszFOPJEUx5Y3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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