SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aff76cd3881b69f67101c696ecec77e49662b83636968f5c7100327e355980f9' 
  AND token = 'Pin3oD4XOSVV9429au59agH2WoT/8KmhI9zv5ZzhBW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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