Your query should be something like this:
$args = array(
'post_type' => 'post',
'posts_per_page' => 1,
'meta_key' => '<ACF FIELD KEY HERE>',
'meta_value' => date( "Ymd" ),
'meta_compare' => '>',
'meta_query' => array(
'key' => '<ACF FIELD KEY HERE>',
'value' => date( "Ymd" ),
'compare' => '>'
),
'orderby' => 'meta_value_datetime',
'order' => 'ASC',
);
$queryPosts = new WP_query($args);
if($queryPosts->have_posts) {
while($queryPosts->have_posts) {
$queryPosts->the_post();
the_title();
}
}