SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a015ffaa949251d71d792ad22409c65d9b38342bed1e5e6f0217e207bc16e540' 
  AND token = 'ZwkHTz9/+sEiN1LWYyvPBwIRPZcdu7gJGLPpWz0WNdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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