Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '386a82096baff052bef02b97d445a69dddb69041670a5a08f8b74211aeb0e395' 
  AND token = '8Di1zj99gvDLTQZ8uW+FCUfgisNsw2jI1xWQoEavrWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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