SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b7286aefa0928908ba5344c738c713c45c778869573c336ac411b9af2274d31' 
  AND token = 'UPmpenivqKpjWwiasyYvAyhgAbEAa3jfo21aI/xVLtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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