Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad5cbbe0d29b139161d0a6312088d19122f905cb266ee58d5dced5578feeba3' 
  AND token = '1czKkAYnOsm84CpqyrLKn1pINuBInznu0BG9e3HMSkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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