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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bdb549f1ab24b6a73d68002e5a55d53a0684796b4f4f2eea1e3ba056afef0ab' 
  AND token = 'BqSxysVvwD1AQHUz5GFe7B0YPOlI5SrSMdbYwzWFJuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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