SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06e9cd6d7c7a528f81c87db7752f6630af4daf5eadc819c672b6e65ffe874d58' 
  AND token = 'I+cNdGRWBwj6dvzv1o1QVDe/meIt0iKXKrnyFOnY18g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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