SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '327178bbf4615e938855df67457312909a3836d6ec53b98e48a15bd59f395649' 
  AND token = 'gGvKsFj+WWCNNI2OOTvnuAzuGqjMGXWZ+SlLvfZI6PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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