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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '446549dcbc56477f9dc8576d99a3159e10b1247c33fd633cdee7d9abd45d36af' 
  AND token = '4wnvXKc51kWlj6C5B6ENRzMhI9040EcmQXRQEOcRuNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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