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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34249740c9cdaf94ca592c472f217bac958a501a94e25b5539743651c8e1517e' 
  AND token = '62sSaQshVF5zl4ztpw+8+7q+UsyNR5End0tPg7P60Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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