SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ce01d55b0865686431f1c2058799cfafbfd052bb8a23b9e538c26ad48d84b00' 
  AND token = 'A6X8v3WVFG5DmCVZ7jiNZlumArBQ5JLtKE4PNNJSGBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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