SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4d9bb5a6b544d3f5a01e4ab4e1cc065706ffc2341a97191d763b8f4f8db2121' 
  AND token = '1sIKvRY3FjePJUINBGb7V2+727BBCf/7HQRYxwzYpVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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