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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bfe970e1ccf47f4205c870e55bd0e9b41c79d53401205f15e3fc6e137ed9608' 
  AND token = '6z9JK2ZY0tgTj0/j6yDeLs3MUdmqrzd1scQbHAHmNEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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