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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e675341889a4c37844191cbbdcf3c72692d142c7206cf6a217b873714990379' 
  AND token = '8qLnwP993R5f6RTQEmTVKH2xwKTssdKcU/LWS48FnhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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