SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ddaa1f4d88266ab3734153eef53673c1ace701b45f2a91db2b88b6d5f89f227' 
  AND token = '6OjLT8LTzMOthzZz5cEIOyjo/qLwHqN5ibDuw5IngSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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