SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e91d8ba99e25a04746b74eec5f2eee613448fd0231517bcc9b2133a9f41f39' 
  AND token = '7Yi/8Xy+4OqDquRPmzBo1I2C8JqC+uZzkaw1OchrDJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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