Here is a working solution, but I'm not sure if it's ok.

if (criteria.getActive() != null) {
    specification = specification.and((root, query, builder) -> {
        HibernateCriteriaBuilder hb = (HibernateCriteriaBuilder) builder;
        JpaExpression<Duration> oneMinute = hb.durationScaled(root.get(Activity_.duration), Duration.ofMinutes(1));
        Expression<ZonedDateTime> result = hb.addDuration(root.get(Activity_.dateStart), oneMinute);
        if (criteria.getActive()) {
            return builder.greaterThanOrEqualTo(result, ZonedDateTime.now());
        }

        return builder.lessThan(result, ZonedDateTime.now());
    });
}