How to set an expiration rule for an S3 object (not bucket)?

I have an S3 bucket containing a number of objects that fall into three classes. They fall into three classes:

1. objects that should expire in 15 minutes,
2. objects that should expire after a day and
3. objects that should never expire automatically.

I would like to use native AWS functionality to do this, rather than running a separate process to scan the bucket and delete objects (yuck).

I really want to avoid having three buckets, with a bucket-level lifecycle rule on each with different expiration periods as it's far easier in my application to set the expiration at object creation time, if this is actually possible.

I think I can do this with three tags and a lifecycle configuration on the bucket, but this seems to have a granularity of 1 day, i.e. I can't delete in less than a day. Setting the expiry date per object would fix this but I can't see any way to do this.

Any ideas welcome :)

David