SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfba678a7a5ae4c8b09dc0bf4319526cdaad213056dd809f29cd55522db49ff3' 
  AND token = '+zxmXsdVIAjDgq+g63dtRps1WkTMi81gYzhZGa7m1f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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