SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74bfea7765b626126b89b48e4f2672cae3f254d5b73d0c887eaf1601e2eb3ba7' 
  AND token = 'bTTtM0+DNYRFXqnuKAFq/1jzoZ4IJXS/f2mM/7q9XBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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