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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46efe39bcdd1c377ae1811efd04c5d9049c96311544911854259ad7fddf01539' 
  AND token = 'ZIzECyhxffDfJ0SJ4GV/tc0B4ik1xIchljb2ZhIWUqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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