Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3ea52cc0a0032f58c8be4783bd0d74ce11a47cf4f4d8fbc6cb2d95303e1b5e8' 
  AND token = 'E5RQusFVrOiMG5NKVtW7BYsi0aSvH9gdIBnVU+Hz0L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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