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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '324336d7511cc9d5e2e1fdef5c5c92953307f44a405c7dce241d3d8825021e21' 
  AND token = 'TOXU86iV9ds1fLqUUUexNyqxfAKpmNzFAPuQAYtwewQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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