Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50a919d96fb9e9703e8dbf808dd742a237c9dae81d9284e2a8c8a409df239063' 
  AND token = 'Nr61kOE40v0ldVWyM1twLyK6WmLa+DxEnUDiSmYPdso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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