SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8283e9c9773d361fa2f731d4636b9b08968caeadb41c4e34762b7240ef3c9f08' 
  AND token = 'igavb6vYPw7nwGsWiDlBbugV2ReDzBY8Qt3ZdOxs/Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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