SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b23261d20d15a8e8f0f716b1489bab6b96484cfd7524a4cc0eeb6481247792f6' 
  AND token = 'ztZSQyh7J7XibC+srKtQJMbPZFWMgk+JyRnyL5+zTjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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