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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9367ade1cd14bcab2dacddbd1d56a670a4a8941f72740973574781452fada199' 
  AND token = 'kAtgIg18AB524aQ1A8bRmGAHt2pwBzC8TKhci8xHv18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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