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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a73d07c3d79e2eedd99bdffd20cc0186f213f1ba8bec122cfc961e4a3e53ce80' 
  AND token = 'hq4NWuTOrmXnAplEVtJeM86kDtl4sDvJyfZmShZDNtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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