Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd513ff42709fca181416700c335ad51a952719c263fd0014659d02b045dab1bd' 
  AND token = '2Cq6WpE9iT8vbayT0SIqwnqzRpRBFz7zRp0li5RSXS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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