SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08cbedf7d4272d103ccc29f6fb337466fcac34095c68f7f7fbc7056540bca75b' 
  AND token = '3BCBYgZJEi7A7UlsEnRNKWsP/JfOQBagO+x0RxhlwL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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