Tool for obtaining a BibTeX entry from a key, without creating it manually

I am looking for a tool, where I only need to write something like alessandroni2015bibtex (this very question) to obtain the BibTeX entry, without needing to rewrite it.

I am aware that Google Scholar always offers a BibTeX link and uses AuthorYearFirst_Word as a scheme, but I do not know how to use this key for searching, because Google uses an internal ID for each BibTeX. Thus, when I feed the data of my citation to Google Scholar, sometimes I do not find it. For example, in case of books, I find only new editions (maybe due to a wrong use of the tool).