SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeda31befe378e00a9b5f12a3f71311f4c4a24b45dddbc092daeb98e61f25b22' 
  AND token = 'OZndfBE8v4sFPdWOVFVHQu7+TkGiu3IzDpXLwRGSvlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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