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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6043dc944dfbdd40319652e6530e79e77d2b1c684c63a67bf21c60b3508c6421' 
  AND token = '6OHalxiYw5cCC6xI/aIbJo31GyR+57bBTsHhyUKuxoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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