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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de34c2cf4b545ae67fc95071641b30e2a8b0d0447df60d596b07535e47e7cece' 
  AND token = 'dwBxqtt09UiTx99NcMkd6Y1AOt9JxWYMrjeGg2aaaWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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