SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b65efa0af17414af507e8209e0f27c2a6cad112e1617c34d7629c156f2e35836' 
  AND token = 'lLLro/jvUyjfXMYUw/Z1b6pgwV4AdfGXVehrNT/cJNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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