SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e335e140e25d39fd293fb0da1fc5f8816abf779a3e1873a32b49d28af29352ed' 
  AND token = 'uVuZodrvYPN6bNOCmXVk5JUKlS8ztqYVn9FagSPAS0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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