SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a060fb94e9aae4eb985fbd4a47f96ed845e3a6415326f1d324c7e691842f275' 
  AND token = 'wb7yPS/8ZeL1r+2IhSBO+Sh+SNt5c2qtKuT8wCJYbXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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