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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9612cb4edc9345a084ad4f88aeca2260a3b9afe8d0ea5d666d069d962a65f5c' 
  AND token = 'tRPB9TE7uJSskrXkaXg2UiuMptCFjL9beivj5Lh9jfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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