SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b160c3559556e8c611986421258ef9bdd26b9a888f477909210ba7a272ccdf80' 
  AND token = 'hjQLmgqWxpvHXHswaxDAJZZjdXEDwyeFuo2wIWMsCtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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