SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d9982dfb887fd49c352882be46d98a4859dcf38847afbaf0e99ed7f21416335' 
  AND token = '6ZDK3Z5CZxOXOXYsl+JdBzPfMfk0UCp/aYlz76LR8G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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