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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5dfb6c3ed8ceba9ea6fa98ed508ad9bb6f87763bc2bcaa767cbf9df3e95563' 
  AND token = 'j25zShez1RaCK6Qnj+6OLOf8FzbNdlBXAF4tm5PnI4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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