SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6cd5393f10f4df8d6484546c4b6c41a02ac0b12ffd6f7722391ab8426c98267' 
  AND token = 'tIXQzdBmyUDL/vPJTi4OobMwzpopBuxjywKJuDI2ozk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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