SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bb2479c429458026f4a8a360a00aafc6c48b478be573644731244105320abee' 
  AND token = 'r6zJiVsFLTZt2zaBMkGBST9D+SZu3hedhhBevdeATqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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