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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ec623362441b8fe1fec7c745274adca165c215b191e2ca167cf42e1b934ac50' 
  AND token = 'hFUldtXb4MvKfdWfaioiFPdQGbtd25bTrwV9lSwK8mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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