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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '238909f173ab13d9cb5beeccd52349d47fc5a3c308c3238622beab6a155cd72d' 
  AND token = 'oBGpk8t2gewdilKNR9tbryl3icaNg9EbsiU/oUrtZ5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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