SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a397170d5b23658b6f398c6b36485f9716d0493f92142f7b46b83d79815ab0b' 
  AND token = '3tSn/A0SAkjQ7TtdBYI45f6Jj7xK7aErOgM8JVHbwWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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