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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '340c13006dedba5908797e7823102388c13c4fe9901383d16348e2808399140f' 
  AND token = '02t2FFsC4yqnyOAgFkrLM/ubDrUigbIdZnYVzs8CxJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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