Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c79497561e21096a5f4f195beedbb39ef32ac535cb0635499c6c58b21dcfcaba' 
  AND token = 'SMntjwfefkcM0950iSykwKaSB2pj03pWWHI++xEhKQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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