Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a69fd9d86d3c646dbeea6ac15f55c1984f35ca44d356cd1d0230b9f795b6e4ba' 
  AND token = 'jMs2jP2EYCmQLuqQgOf8/mcfMgr04RCgCQ7DYgrRnlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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