SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab835519ba01b8400564c14f97ef2a609fa9aef7ccddfc090a02d27a5d94b14' 
  AND token = 'Vizwh3FjEJYy5ZyXyuqLaRV0/WOz4NlDLQHnPel1lXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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