SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13356538960fa87e5f234165b6a48f7fe9975912f7842d6a5a0db0769bb6e6e1' 
  AND token = 'ILWBsah8scAONXDeGMWUPx0XCrvKHz6Rq52gKd2Rwew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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