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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0071e99d92ccf1db2692dc5d9c71f7b616962ee9bcea29bada86790ab9750f52' 
  AND token = 'CqlJSlg63NV5YFE12S/M/93RQuNH12KVEKTUTMos0QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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