まるでコロナがないかのようだった！ - It was as if there was no corona/covid もしくは It was as if we weren't in a pandemic.
Pandemic - パンデミック(世界的大流行)
コロナ禍 - Coronavirus pandemic
It seemed as if we were back in pre corona/pre covid times - コロナの前と同じように見えた。
Example
When I went to ... It seemed as if I was back in pre covid times.
When I went to ... It was as if we weren't in a pandemic.
When I went to ... It was as if there was no corona.
It was as if COVID didn’t exist.
「まるで〜ないかのようだった」は、英語では as if / as though を使うと、とても自然に言えます。
It was as if COVID didn’t exist. は直訳に近く、「コロナが存在しないみたいだった」という強い驚きが出ます。感想として短く言えて、会話で使いやすい形です。
イギリス 
アメリカ合衆国 
