You can use hook_preprocess_html() in your theme's yourtheme.theme file.
Following code will add a body class bdyCls to <body> if certain condition matches.
/**
* Implement hook_preprocess_html
*/
function yourtheme_preprocess_html(&$html) {
if ($condition) {
$html['body_class'] .= 'your-custom-css-class';
}
}
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