SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dd2f1d12a6cfeb6427ab6754bf6ee37b0417a222dfe0670c24d2b3588976340' 
  AND token = 'sDBXR0JF0ZAQUiKjNQjnFhMFHeYLSk6dgQxzzRUHNSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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