SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b41e3e33026b23bbd7be6dd1b5669fe2af56f063cb0aa8c40db142ac5a3c739f' 
  AND token = 'JySR+mHawj+TcxzQ60FL2wuBrB2UxKJAfCKIq5giSRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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