SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b658b7710a2e0c889e119e455794a1830218b6f7cfb88730a564d485fc28b9' 
  AND token = 'LqdyWVU3ExK8OG9H0MsMNzA5VN0tUVj+GI1+F2PY5QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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