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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e2527d6bf0eb180829be028c95d31a506a379f3a35af8a2e27a55a5f2315867' 
  AND token = '+zLPKIMaq1XamJ8k2l10mFsBHPyBnj6t6OdRNVGHR5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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