SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a7a157118785e16be55730a23d958d5907461af8d60201bd90f5b96df3b9dab' 
  AND token = 'VIAottJdVTUmnHzFuRkgKT28ijrHZvit/RGQ1of7MF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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