SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33c6bcd77935822da758d5f4cdc63955c57baac22f20e5d09b2f8e51f303bf27' 
  AND token = 'HfFVD3KnGXtjDyOv6KcWfhP1Q43EVxqHXv8c0QkCzqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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