SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bab33fc880290f5bca5cd1f2468478eff07a36713a340bd26108a749fecb668c' 
  AND token = 'BqDQL4RF/Lh5XJWF5JIq6+uGCdYfM/k5nOWqDjWExHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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