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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ab75b84fc766a0c69394c04053c41fcfac392fa32b3d877da4b012faac855c8' 
  AND token = 'KZTDSM2RbjfJm1WoJs+wB6yeIeciBByPWZLxtAi8DWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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