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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bbbab6ec1956e5585e615e7a52519cfd0a55281947bbb5f7f6968208ca9b717' 
  AND token = 'xVY/9gEt37sLyCohgClflKy4lNSe9DZnEXgk/x/TIh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}