Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f0f6568950ac5bccbf553c0f7da81ddceb2ec76c58b987a6053acba492a1bad' 
  AND token = 'dHYhPmFPUjmD7Aeg9WJ3VzKzp0QyYaFixiTcQ+0oQEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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