Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a6e8bd3e40860d63f9c37bb6e5703ba61b8a7a538003c02ac40f3b5fba346d1' 
  AND token = '7+lBzEDJbqAqjO4LpaZkkZY7RHgEU20NyEgASJTBmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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