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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac2390eef0e5089ad0224f6f25d9ed982864c562a56a87b059b8ef8d00c8d41' 
  AND token = 'W69nbBMEjNVO4Qa9J4KVsKphG0JiAfrrqifZ+Y785rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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