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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a731bd2830d151722ec16bab4d0bf3f104f1f409526f9655e76d7a22011355b' 
  AND token = 'WFxadw4V7bQZMM0vd10oBcBCdVmJvYqGyb6MqogRdn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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