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/**
* Implements hook_search_api_query_alter().
*/
function my_module_search_api_query_alter($query) {
  $base_filter = $query->createFilter('AND');
  $base_filter->condition('status', 1);
  $subfilter = $query->createFilter('OR');
  $subfilter->condition('field_my_field', 'value');
  $subfilter->condition('field_other_field', 'value2');
  $base_filter->filter($subfilter);
  $query->filter($base_filter);
}