SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5272655ffcd02b57a1c32a27c7e6456f123dad5658b41be9b19dfc9c737b718e' 
  AND token = 'G7GKvRRjWJT7wGPtWSxIDELoHBprFmM+BF6vxrUmkeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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