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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68bc9ebec04add330e8557ec39648affea8b96f38cf9a213a195f15c7ae15dcc' 
  AND token = 'IDxFLE3JZFloTavYoznlc/mt0ecTDo+gqBl4oxfOQ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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