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The phrase "This is key" is correct and commonly used in written English.
It is typically used to emphasize the importance of something or to indicate that something is essential or crucial. Example: "In order to succeed in this project, having a detailed plan and clear communication is key."
Exact(60)
This is key," he added.
This is key for us.
This is key for me.
This is key to Sullivan's approach.
This is key to bringing real change to the people.
"This is key to whether he remains president".
"This is key to cutting the chains of contagion.
This is key to the day-to-day operations.
This is key for FaceTime.
This is key to Scotland's attacking game.
This is key to this investigation.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com