SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbccdb00a6c5684477b22d7e29e265b4571f5ed2816801d4fce4fa23a207f5dd' 
  AND token = 'nvjJqdpQsVYGEpJUND9NW9WuH9fk6P2lb2+UqqGXR5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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