You can create a custom redirect setup, using CloudPages.
In you email, you use CloudPageUrl, given your redirect CloudPage has ID 1234:
<p>
<a href="%%=RedirectTo(CloudPagesURL(1234, 'ExpirationDate', '2018-11-25', 'Destination', 'http://www.salesforce.com/','Fallback','http://www.exacttarget.com/')=%%" alias="Link to somewhere">
Take me there
</a></p>
Here you define both the expiration date, the correct URL, and the fallback URL, which is followed after expiry date is reached. Your CloudPage should not contain more than the code below:
%%[
SET @FormattedExpirationDate = Format(@ExpirationDate, "yyyy-MM-dd")
SET @Today = Format(Now(), "yyyy-MM-dd")
IF (DateDiff(@FormattedExpirationDate,@Today,'D')<0) THEN
Redirect(@Destination)
ELSE
Redirect(@Fallback)
ENDIF
]%%
Using Redirect takes the URL defined in the CloudPageUrl in your email, and picks the URL depending on the date.
Please keep in mind, that CloudPage impressions consume SuperMessages, so be aware of this solution having a potential impact on your license - depending on how much traffic you generate to this page.
To avoid using SuperMessages, you can utilize a code resource for redirect. This can be a simple TXT code resource, which will simply redirect the visitor to either destination or fallback url.