Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd82e7d7cfd6d5a09ed89bd7aef3b5bd7f48ae8de9757135105207a79dcc24a8b' 
  AND token = 'D1w6XFQG0vTxtCdU8wEyfQ1P/Ei0rHrcgYyGD4L2+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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